I've started drawing plans which conferences/workshops to visit in 2006. Not all dates are known to me (probably many of the conferences themselves are (still) unknown to me). And my definitive schedule will depend on how flexible my new employer will be. My top three:
Is there a web site that lists all planned conferences/workshops? That would be extremely convenient.
The YAPC Europe Foundation has the dates of the conferences and workshops.
Check out the left column on www.perl.org/events.html. I think that should help, though it's dependant on Robert Spier's knowledge of the event. If he doesn't hear about it, it doesn't get posted.